{******************************************************************************}
{* DCPcrypt v2.0 written by David Barton (crypto@cityinthesky.co.uk) **********}
{******************************************************************************}
{* A binary compatible implementation of SHA512 *******************************}
{******************************************************************************}
{* Copyright (c) 1999-2002 David Barton                                       *}
{* Permission is hereby granted, free of charge, to any person obtaining a    *}
{* copy of this software and associated documentation files (the "Software"), *}
{* to deal in the Software without restriction, including without limitation  *}
{* the rights to use, copy, modify, merge, publish, distribute, sublicense,   *}
{* and/or sell copies of the Software, and to permit persons to whom the      *}
{* Software is furnished to do so, subject to the following conditions:       *}
{*                                                                            *}
{* The above copyright notice and this permission notice shall be included in *}
{* all copies or substantial portions of the Software.                        *}
{*                                                                            *}
{* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *}
{* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,   *}
{* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL    *}
{* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER *}
{* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING    *}
{* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER        *}
{* DEALINGS IN THE SOFTWARE.                                                  *}
{******************************************************************************}
unit DCPsha512;

interface
uses
  Classes, Sysutils, DCPcrypt2, DCPconst;

type
  TDCP_sha512base= class(TDCP_hash)
  protected
    LenHi, LenLo: int64;
    Index: DWord;
    CurrentHash: array[0..7] of int64;
    HashBuffer: array[0..127] of byte;
    procedure Compress;
  public
    procedure Update(const Buffer; Size: longword); override;
    procedure Burn; override;
  end;

  TDCP_sha384= class(TDCP_sha512base)
  public
    class function GetId: integer; override;
    class function GetAlgorithm: string; override;
    class function GetHashSize: integer; override;
    class function SelfTest: boolean; override;
    procedure Init; override;
    procedure Final(var Digest); override;
  end;

  TDCP_sha512= class(TDCP_sha512base)
  public
    class function GetId: integer; override;
    class function GetAlgorithm: string; override;
    class function GetHashSize: integer; override;
    class function SelfTest: boolean; override;
    procedure Init; override;
    procedure Final(var Digest); override;
  end;

{******************************************************************************}
{******************************************************************************}
implementation
{$R-}{$Q-}

function SwapDWord(a: int64): int64;
begin
  Result:= ((a and $FF) shl 56) or ((a and $FF00) shl 40) or ((a and $FF0000) shl 24) or ((a and $FF000000) shl 8) or
    ((a and $FF00000000) shr 8) or ((a and $FF0000000000) shr 24) or ((a and $FF000000000000) shr 40) or ((a and $FF00000000000000) shr 56);
end;

procedure TDCP_sha512base.Compress;
var
  a, b, c, d, e, f, g, h, t1, t2: int64;
  W: array[0..79] of int64;
  i: longword;
begin
  Index:= 0;
  a:= CurrentHash[0]; b:= CurrentHash[1]; c:= CurrentHash[2]; d:= CurrentHash[3];
  e:= CurrentHash[4]; f:= CurrentHash[5]; g:= CurrentHash[6]; h:= CurrentHash[7];
  Move(HashBuffer,W,Sizeof(HashBuffer));
  for i:= 0 to 15 do
    W[i]:= SwapDWord(W[i]);
  for i:= 16 to 79 do
    W[i]:= (((W[i-2] shr 19) or (W[i-2] shl 45)) xor ((W[i-2] shr 61) or (W[i-2] shl 3)) xor
      (W[i-2] shr 6)) + W[i-7] + (((W[i-15] shr 1) or (W[i-15] shl 63)) xor ((W[i-15] shr 8) or
      (W[i-15] shl 56)) xor (W[i-15] shr 7)) + W[i-16];

{
Non-optimised version
  for i:= 0 to 79 do
  begin
    t1:= h + (((e shr 14) or (e shl 50)) xor ((e shr 18) or (e shl 46)) xor ((e shr 41) or (e shl 23))) +
      ((e and f) xor (not e and g)) + K[i] + W[i];
    t2:= (((a shr 28) or (a shl 36)) xor ((a shr 34) or (a shl 30)) xor ((a shr 39) or (a shl 25))) +
      ((a and b) xor (a and c) xor (b and c));
    h:= g; g:= f; f:= e; e:= d + t1; d:= c; c:= b; b:= a; a:= t1 + t2;
  end;
}

  t1:= h + (((e shr 14) or (e shl 50)) xor ((e shr 18) or (e shl 46)) xor ((e shr 41) or (e shl 23))) + ((e and f) xor (not e and g)) + $428a2f98d728ae22 + W[0]; t2:= (((a shr 28) or (a shl 36)) xor ((a shr 34) or (a shl 30)) xor ((a shr 39) or (a shl 25))) + ((a and b) xor (a and c) xor (b and c)); d:= d + t1; h:= t1 + t2;
  t1:= g + (((d shr 14) or (d shl 50)) xor ((d shr 18) or (d shl 46)) xor ((d shr 41) or (d shl 23))) + ((d and e) xor (not d and f)) + $7137449123ef65cd + W[1]; t2:= (((h shr 28) or (h shl 36)) xor ((h shr 34) or (h shl 30)) xor ((h shr 39) or (h shl 25))) + ((h and a) xor (h and b) xor (a and b)); c:= c + t1; g:= t1 + t2;
  t1:= f + (((c shr 14) or (c shl 50)) xor ((c shr 18) or (c shl 46)) xor ((c shr 41) or (c shl 23))) + ((c and d) xor (not c and e)) + $b5c0fbcfec4d3b2f + W[2]; t2:= (((g shr 28) or (g shl 36)) xor ((g shr 34) or (g shl 30)) xor ((g shr 39) or (g shl 25))) + ((g and h) xor (g and a) xor (h and a)); b:= b + t1; f:= t1 + t2;
  t1:= e + (((b shr 14) or (b shl 50)) xor ((b shr 18) or (b shl 46)) xor ((b shr 41) or (b shl 23))) + ((b and c) xor (not b and d)) + $e9b5dba58189dbbc + W[3]; t2:= (((f shr 28) or (f shl 36)) xor ((f shr 34) or (f shl 30)) xor ((f shr 39) or (f shl 25))) + ((f and g) xor (f and h) xor (g and h)); a:= a + t1; e:= t1 + t2;
  t1:= d + (((a shr 14) or (a shl 50)) xor ((a shr 18) or (a shl 46)) xor ((a shr 41) or (a shl 23))) + ((a and b) xor (not a and c)) + $3956c25bf348b538 + W[4]; t2:= (((e shr 28) or (e shl 36)) xor ((e shr 34) or (e shl 30)) xor ((e shr 39) or (e shl 25))) + ((e and f) xor (e and g) xor (f and g)); h:= h + t1; d:= t1 + t2;
  t1:= c + (((h shr 14) or (h shl 50)) xor ((h shr 18) or (h shl 46)) xor ((h shr 41) or (h shl 23))) + ((h and a) xor (not h and b)) + $59f111f1b605d019 + W[5]; t2:= (((d shr 28) or (d shl 36)) xor ((d shr 34) or (d shl 30)) xor ((d shr 39) or (d shl 25))) + ((d and e) xor (d and f) xor (e and f)); g:= g + t1; c:= t1 + t2;
  t1:= b + (((g shr 14) or (g shl 50)) xor ((g shr 18) or (g shl 46)) xor ((g shr 41) or (g shl 23))) + ((g and h) xor (not g and a)) + $923f82a4af194f9b + W[6]; t2:= (((c shr 28) or (c shl 36)) xor ((c shr 34) or (c shl 30)) xor ((c shr 39) or (c shl 25))) + ((c and d) xor (c and e) xor (d and e)); f:= f + t1; b:= t1 + t2;
  t1:= a + (((f shr 14) or (f shl 50)) xor ((f shr 18) or (f shl 46)) xor ((f shr 41) or (f shl 23))) + ((f and g) xor (not f and h)) + $ab1c5ed5da6d8118 + W[7]; t2:= (((b shr 28) or (b shl 36)) xor ((b shr 34) or (b shl 30)) xor ((b shr 39) or (b shl 25))) + ((b and c) xor (b and d) xor (c and d)); e:= e + t1; a:= t1 + t2;
  t1:= h + (((e shr 14) or (e shl 50)) xor ((e shr 18) or (e shl 46)) xor ((e shr 41) or (e shl 23))) + ((e and f) xor (not e and g)) + $d807aa98a3030242 + W[8]; t2:= (((a shr 28) or (a shl 36)) xor ((a shr 34) or (a shl 30)) xor ((a shr 39) or (a shl 25))) + ((a and b) xor (a and c) xor (b and c)); d:= d + t1; h:= t1 + t2;
  t1:= g + (((d shr 14) or (d shl 50)) xor ((d shr 18) or (d shl 46)) xor ((d shr 41) or (d shl 23))) + ((d and e) xor (not d and f)) + $12835b0145706fbe + W[9]; t2:= (((h shr 28) or (h shl 36)) xor ((h shr 34) or (h shl 30)) xor ((h shr 39) or (h shl 25))) + ((h and a) xor (h and b) xor (a and b)); c:= c + t1; g:= t1 + t2;
  t1:= f + (((c shr 14) or (c shl 50)) xor ((c shr 18) or (c shl 46)) xor ((c shr 41) or (c shl 23))) + ((c and d) xor (not c and e)) + $243185be4ee4b28c + W[10]; t2:= (((g shr 28) or (g shl 36)) xor ((g shr 34) or (g shl 30)) xor ((g shr 39) or (g shl 25))) + ((g and h) xor (g and a) xor (h and a)); b:= b + t1; f:= t1 + t2;
  t1:= e + (((b shr 14) or (b shl 50)) xor ((b shr 18) or (b shl 46)) xor ((b shr 41) or (b shl 23))) + ((b and c) xor (not b and d)) + $550c7dc3d5ffb4e2 + W[11]; t2:= (((f shr 28) or (f shl 36)) xor ((f shr 34) or (f shl 30)) xor ((f shr 39) or (f shl 25))) + ((f and g) xor (f and h) xor (g and h)); a:= a + t1; e:= t1 + t2;
  t1:= d + (((a shr 14) or (a shl 50)) xor ((a shr 18) or (a shl 46)) xor ((a shr 41) or (a shl 23))) + ((a and b) xor (not a and c)) + $72be5d74f27b896f + W[12]; t2:= (((e shr 28) or (e shl 36)) xor ((e shr 34) or (e shl 30)) xor ((e shr 39) or (e shl 25))) + ((e and f) xor (e and g) xor (f and g)); h:= h + t1; d:= t1 + t2;
  t1:= c + (((h shr 14) or (h shl 50)) xor ((h shr 18) or (h shl 46)) xor ((h shr 41) or (h shl 23))) + ((h and a) xor (not h and b)) + $80deb1fe3b1696b1 + W[13]; t2:= (((d shr 28) or (d shl 36)) xor ((d shr 34) or (d shl 30)) xor ((d shr 39) or (d shl 25))) + ((d and e) xor (d and f) xor (e and f)); g:= g + t1; c:= t1 + t2;
  t1:= b + (((g shr 14) or (g shl 50)) xor ((g shr 18) or (g shl 46)) xor ((g shr 41) or (g shl 23))) + ((g and h) xor (not g and a)) + $9bdc06a725c71235 + W[14]; t2:= (((c shr 28) or (c shl 36)) xor ((c shr 34) or (c shl 30)) xor ((c shr 39) or (c shl 25))) + ((c and d) xor (c and e) xor (d and e)); f:= f + t1; b:= t1 + t2;
  t1:= a + (((f shr 14) or (f shl 50)) xor ((f shr 18) or (f shl 46)) xor ((f shr 41) or (f shl 23))) + ((f and g) xor (not f and h)) + $c19bf174cf692694 + W[15]; t2:= (((b shr 28) or (b shl 36)) xor ((b shr 34) or (b shl 30)) xor ((b shr 39) or (b shl 25))) + ((b and c) xor (b and d) xor (c and d)); e:= e + t1; a:= t1 + t2;
  t1:= h + (((e shr 14) or (e shl 50)) xor ((e shr 18) or (e shl 46)) xor ((e shr 41) or (e shl 23))) + ((e and f) xor (not e and g)) + $e49b69c19ef14ad2 + W[16]; t2:= (((a shr 28) or (a shl 36)) xor ((a shr 34) or (a shl 30)) xor ((a shr 39) or (a shl 25))) + ((a and b) xor (a and c) xor (b and c)); d:= d + t1; h:= t1 + t2;
  t1:= g + (((d shr 14) or (d shl 50)) xor ((d shr 18) or (d shl 46)) xor ((d shr 41) or (d shl 23))) + ((d and e) xor (not d and f)) + $efbe4786384f25e3 + W[17]; t2:= (((h shr 28) or (h shl 36)) xor ((h shr 34) or (h shl 30)) xor ((h shr 39) or (h shl 25))) + ((h and a) xor (h and b) xor (a and b)); c:= c + t1; g:= t1 + t2;
  t1:= f + (((c shr 14) or (c shl 50)) xor ((c shr 18) or (c shl 46)) xor ((c shr 41) or (c shl 23))) + ((c and d) xor (not c and e)) + $0fc19dc68b8cd5b5 + W[18]; t2:= (((g shr 28) or (g shl 36)) xor ((g shr 34) or (g shl 30)) xor ((g shr 39) or (g shl 25))) + ((g and h) xor (g and a) xor (h and a)); b:= b + t1; f:= t1 + t2;
  t1:= e + (((b shr 14) or (b shl 50)) xor ((b shr 18) or (b shl 46)) xor ((b shr 41) or (b shl 23))) + ((b and c) xor (not b and d)) + $240ca1cc77ac9c65 + W[19]; t2:= (((f shr 28) or (f shl 36)) xor ((f shr 34) or (f shl 30)) xor ((f shr 39) or (f shl 25))) + ((f and g) xor (f and h) xor (g and h)); a:= a + t1; e:= t1 + t2;
  t1:= d + (((a shr 14) or (a shl 50)) xor ((a shr 18) or (a shl 46)) xor ((a shr 41) or (a shl 23))) + ((a and b) xor (not a and c)) + $2de92c6f592b0275 + W[20]; t2:= (((e shr 28) or (e shl 36)) xor ((e shr 34) or (e shl 30)) xor ((e shr 39) or (e shl 25))) + ((e and f) xor (e and g) xor (f and g)); h:= h + t1; d:= t1 + t2;
  t1:= c + (((h shr 14) or (h shl 50)) xor ((h shr 18) or (h shl 46)) xor ((h shr 41) or (h shl 23))) + ((h and a) xor (not h and b)) + $4a7484aa6ea6e483 + W[21]; t2:= (((d shr 28) or (d shl 36)) xor ((d shr 34) or (d shl 30)) xor ((d shr 39) or (d shl 25))) + ((d and e) xor (d and f) xor (e and f)); g:= g + t1; c:= t1 + t2;
  t1:= b + (((g shr 14) or (g shl 50)) xor ((g shr 18) or (g shl 46)) xor ((g shr 41) or (g shl 23))) + ((g and h) xor (not g and a)) + $5cb0a9dcbd41fbd4 + W[22]; t2:= (((c shr 28) or (c shl 36)) xor ((c shr 34) or (c shl 30)) xor ((c shr 39) or (c shl 25))) + ((c and d) xor (c and e) xor (d and e)); f:= f + t1; b:= t1 + t2;
  t1:= a + (((f shr 14) or (f shl 50)) xor ((f shr 18) or (f shl 46)) xor ((f shr 41) or (f shl 23))) + ((f and g) xor (not f and h)) + $76f988da831153b5 + W[23]; t2:= (((b shr 28) or (b shl 36)) xor ((b shr 34) or (b shl 30)) xor ((b shr 39) or (b shl 25))) + ((b and c) xor (b and d) xor (c and d)); e:= e + t1; a:= t1 + t2;
  t1:= h + (((e shr 14) or (e shl 50)) xor ((e shr 18) or (e shl 46)) xor ((e shr 41) or (e shl 23))) + ((e and f) xor (not e and g)) + $983e5152ee66dfab + W[24]; t2:= (((a shr 28) or (a shl 36)) xor ((a shr 34) or (a shl 30)) xor ((a shr 39) or (a shl 25))) + ((a and b) xor (a and c) xor (b and c)); d:= d + t1; h:= t1 + t2;
  t1:= g + (((d shr 14) or (d shl 50)) xor ((d shr 18) or (d shl 46)) xor ((d shr 41) or (d shl 23))) + ((d and e) xor (not d and f)) + $a831c66d2db43210 + W[25]; t2:= (((h shr 28) or (h shl 36)) xor ((h shr 34) or (h shl 30)) xor ((h shr 39) or (h shl 25))) + ((h and a) xor (h and b) xor (a and b)); c:= c + t1; g:= t1 + t2;
  t1:= f + (((c shr 14) or (c shl 50)) xor ((c shr 18) or (c shl 46)) xor ((c shr 41) or (c shl 23))) + ((c and d) xor (not c and e)) + $b00327c898fb213f + W[26]; t2:= (((g shr 28) or (g shl 36)) xor ((g shr 34) or (g shl 30)) xor ((g shr 39) or (g shl 25))) + ((g and h) xor (g and a) xor (h and a)); b:= b + t1; f:= t1 + t2;
  t1:= e + (((b shr 14) or (b shl 50)) xor ((b shr 18) or (b shl 46)) xor ((b shr 41) or (b shl 23))) + ((b and c) xor (not b and d)) + $bf597fc7beef0ee4 + W[27]; t2:= (((f shr 28) or (f shl 36)) xor ((f shr 34) or (f shl 30)) xor ((f shr 39) or (f shl 25))) + ((f and g) xor (f and h) xor (g and h)); a:= a + t1; e:= t1 + t2;